Plural-layer winding with cooling slits



Aug. 16, 1960 A. EDLINGER PLURAL-LAYER WINDING WITH COOLING SLITS Filed Nov. 19, 1957 United States Patent 2,949,590 PLURAL-LAYER WINDING WITH COOLING SLITS Anton Edlinger, Wettingen, Switzerland, assignor to Aktlengesellschaft Brown, Boveri & Cie., Baden, Switzerland, a joint-stock company Filed Nov. 19, 1957, Ser. No. 697,441 Claims priority, application Switzerland Dec. 10, 1957 3 Claims. (Cl. 336-60) interior of the winding. To meet this situation, cooling slits have been applied in the windings, so that the coolmg agent could flow within the winding. Although this improved the cooling eifect, it had the drawback of deteriorating the insulation, since solid gaseous insulating substance laid side by side, through which the field strength distribution became uneven as difiiculties.

The suggestion had also been advanced to allow the coohng agent to stream past the electrically highly strained places with a greater velocity than past the electrically less strained places. However, this required special measures for changing the flow-through velocity.

cooling agent, portion of each layer is rinsed on at least one side by the cooling agent.

The inventive idea will now be explained in more detail with reference to the accompanying drawing in Which the single figure diagrammatically illustrates principles of the invention. The figure represents a sectional view taken through only half of the coil; only the first four and last four layers are shown. A plural-layer winding is designated having a first four concentricallyarranged layers 21-24 and a last four concentricallyarranged layers ZS-'28. The voltage is led in at connector '2 and out at connector 3. The individual layers are connected with each other through the connecting members 4, 4. At the places where no connecting member is attached there is provided a solid insulation annular member 5. The latter therefore lies precisely adjacent those portions of the layer winding between which the potential difference is great. At the portions where the connecting members 4 lie, there is no potential difference between the layers; therefore, no solid insulation needs to be provided continuously there. The path of the cooling agent is indicated by the arrows. It enters the winding at the places where the voltage strain is slight and where, consequently, the connections 4 are. It exits again at the portions of the windings where the reciprocal voltage strain is likewise slight. In this, however, the cooling agent must be able to move from the lower slit 6 into the upper slit 7. For this purpose 0penings 8 are provided in the layers through which the cooling agent can flow. These openings are located in the inner layers 22 2.7. Such openings are not necessary in the outer layers 21 and 28, as indicated by the shading in the figure.

The solid insulation between the layers can be provided exclusively by paper, so that the homogeneity of the insulation is assured. Instead of one larger opening in the middle of a layer there can also be provided several smaller openings. The solid insulation can, in this case, also be reversed in the known manner for further improvement in the voltage resistance.

The advantages of the arrangement can be clearly seen from the figure. The same consist in the possibility of using homogeneous insulating materials at the highly strained portions and in the rinsing of all winding portions by the coolant. In the second layer, for example, the cooling agent flows past on the left in the lower half, and on the right in the upper half. In the third layer it is inverted. The cooling agent therefore contacts each portion of the winding on at least one side.

I claim:

1. A plural-layer winding for a high voltage coil adapted to be cooled by a cooling medium comprising a plurality of concentrically-arranged mutually-spaced substantially-tubular Winding layers each having substantially the same length, connector means electrically connecting said layers in series comprising connectors alternately connecting adjacent layers on opposite ends thereof, and solid annular insulation members intermediate each successive pair of said tubular winding layers at that end thereof which is opposite the connector electrically connecting said layers, said annular members extending intermediate said winding layers less than half the length of said winding layers, the winding layers intermediate the innermost and the outermost layers having openings in the walls thereof intermediate their ends, each successive pair of said winding layers being open at that end which is electrically connected by said connector to define cooling passages through the open end of a first successive pair of winding layers, through the opening in the wall of one of the winding layers of said pair, and through the open end of the next adjacent successive winding layer pair.

2. A plural-layer winding as defined in claim 1 wherein said solid annular insulation members consist exclusively of paper.

3. A plural-layer winding as defined in claim 1 wherein the innermost and outermost layers are imperforate.

References Cited in the file of this patent FOREIGN PATENTS 592,553 Germany Feb. 10, 1934 

